The drone has no father but has a grandfather. How is that?

The queen and workers are female bees with a diploid set of chromosomes. The drones are male with a haploid set of chromosomes. To get a worker, the queen must add sperm to the egg. There must be a male to provide that sperm. To get a male, she does nothing but deposit the egg in a cell. No sperm in needed from a male bee. – Ed Beary